Answer:
Explanation:
Dna is shaped as a double helix and has weak hydrogen bonds. They contain complementary base pairs (adenine and thymine) and (guanine and cytosine).
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Some spicules are formed of the mineralized substances calcium carbonate and silica, while others are made of an organic substance called spongin. Sponginskeletons<span> were and are used as scrubbers in bathtubs, though they are fairly expensive. The ubiquitous bathtub accessory called a lufa is NOT a </span>sponge<span>, but a plant.</span>
Aerobic respiration occurs in the presence of oxygen producing a lot of energy, carbon dioxide and water. ... The energy released due to the breakdown of sugar molecule is stored in ATP. Each ATP molecule gives 7200 calories of energy. This energy is stored in the form of phosphate bonds.
The correct answer is A. a substance that is alkaline
